Battery management system

Patent metadata

Field	Value
Publication number	US-2018062210-A1
Application number	US-201715408067-A
Country	US
Kind code	A1
Filing date	Jan 17, 2017
Priority date	Aug 30, 2016
Publication date	Mar 1, 2018
Grant date	—

Abstract

An embodiment of the present invention provides a battery management system including an insulation resistance estimator configured to estimate insulation resistance corresponding to internal temperature and pressure of a battery pack to obtain an estimated value of the insulation resistance, a concentration estimator configured to estimate an internal gas concentration of the battery pack corresponding to the estimated value of the insulation resistance, a cell failure detector configured to detect whether a plurality of battery cells fail based on a state of charge (SOC) and a voltage of the plurality of battery cells accommodated in the battery pack, and a leak determiner configured to determine whether a battery cell leaks based on a detected result of the cell failure detector and based on the internal gas concentration corresponding to the estimated value of the insulation resistance.

First claim

What is claimed is:

1 . A battery management system comprising:
an insulation resistance estimator configured to estimate insulation resistance corresponding to internal temperature and pressure of a battery pack to obtain an estimated value of the insulation resistance; a concentration estimator configured to estimate an internal gas concentration of the battery pack corresponding to the estimated value of the insulation resistance; a cell failure detector configured to detect whether a plurality of battery cells fail based on a state of charge (SOC) and a voltage of the plurality of battery cells accommodated in the battery pack; and a leak determiner configured to determine whether a battery cell leaks based on a detected result of the cell failure detector and based on the internal gas concentration corresponding to the estimated value of the insulation resistance.

2 . The battery management system of claim 1 , wherein the insulation resistance estimator is configured to estimate the insulation resistance by using an insulation resistance function representing a correlation between temperature, pressure, and insulation resistance.

3 . The battery management system of claim 1 , wherein the leak determiner is configured to determine that a leakage of the battery cell occurs when:
a cell failure is detected by the cell failure detector; and the internal gas concentration corresponding to the estimated value of the insulation resistance is greater than a leak threshold value.

4 . The battery management system of claim 1 , wherein the concentration estimator is configured to estimate the internal gas concentration by using a relationship function representing a relationship between the insulation resistance of the battery pack and the internal gas concentration of the battery pack.

5 . The battery management system of claim 4 , further comprising a state of health (SOH) estimator configured to estimate the SOH of the battery cell,
wherein the concentration estimator is configured to estimate the internal gas concentration by using another relationship function corresponding to the SOH.

6 . The battery management system of claim 1 , further comprising an insulation resistance measurer configured to obtain a measured value of the insulation resistance by measuring the insulation resistance of the battery pack,
wherein the concentration estimator is configured to estimate the internal gas concentration of the battery pack corresponding to the measured value of the insulation resistance, and wherein the leak determiner is configured to determine whether the battery pack leaks based on a detected result of the cell failure detector, the estimated value of the insulation resistance, the measured value of the insulation resistance, the internal gas concentration corresponding to the estimated value of the insulation resistance, and the internal gas concentration corresponding to the measured value of the insulation resistance.

7 . The battery management system of claim 6 , wherein the leak determiner is configured to determine that leakage of the battery pack occurs when:
all of the plurality of battery cells are in a normal state; and the internal gas concentration corresponding to the estimated value of the insulation resistance is greater than a leak threshold value.

8 . The battery management system of claim 6 , wherein the leak determiner is configured to determine that leakage of the battery pack occurs when:
all of the plurality of battery cells are in a normal state; the internal gas concentration corresponding to the estimated value of the insulation resistance is equal to or less than a leak threshold value; the estimated value of the insulation resistance is greater than the measured value of the insulation resistance; and a difference between the internal gas concentration corresponding to the estimated value of the insulation resistance and the internal gas concentration corresponding to the measured value of the insulation resistance is greater than a threshold value.

9 . The battery management system of claim 6 , wherein the leak determiner is configured to determine a state necessary to warn of a potential leakage of the battery pack when:
all of the plurality of battery cells are in a normal state; the internal gas concentration corresponding to the estimated value of the insulation resistance is equal to or less than a leak threshold value; the estimated value of the insulation resistance is greater than the measured value of the insulation resistance; and a difference between the internal gas concentration corresponding to the estimated value of the insulation resistance and the internal gas concentration corresponding to the measured value of the insulation resistance is equal to or less than a threshold value.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Duk Jung

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2010/4278

  Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller · CPC title

• H01M10/4228

  Leak testing of cells or batteries · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title